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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf06838f1a3f14e0df4f5afad31b9ed73f1a1fecdff32524ff0e29b07edf0580' 
  AND token = 'r5NY2gjHsPF0Twtv237iZdlLBZul3TUuUjt8Oeab//c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}